Lock error trying to save a PCB - Software - KiCad.info Forums

(apologies if this is in the wrong category) I have been working on a PCB which saved fine yesterday. Made some minor tweaks today and on saving, I’m seeing the following: Can I get some advice on how to proceed? There’s only myself using the software and file system so I know it hasn’t been grabbed by someone else. Files exist on a OneDrive folder and definitely exist on the local filesystem. EDIT: I saved a copy (ok), closed and then tried re-opening the PCB and got this error

Error exporting schematic to PCB - Layout - KiCad.info Forums

Schematic and PCB problems after upgrading from V6.x to V7.x

Error exporting schematic to PCB - Layout - KiCad.info Forums

Lock error trying to save a PCB - Software - KiCad.info Forums

I do not know what I am doing wrong - Software - KiCad.info Forums

Our KiCad EDA experience with ATX breakout v2 – Dangerous Prototypes

A lot of errors on Update Schematic from PCB - Footprints - KiCad

A lot of errors on Update Schematic from PCB - Footprints - KiCad

MMJoy PCB design - #36 by gadget - Hardware & Tech Questions

PCB Layout CAD - Correcting Errors

Update PCB from schematic (Not Responding) - Layout - KiCad.info

A lot of errors on Update Schematic from PCB - Footprints - KiCad